Localizing the focus of a converging ultrasonic beam using finite amplitude effects.

Özyar, M. Serhat


Transient response of an infinite elastic medium containing a spherical cavity subjected to torsion
Zakout, U; Akkas, Z; Tupholme, GE (2000-06-01)
An exact closed-form solution is obtained for the transient response of an infinite isotropic elastic medium containing a spherical cavity subjected to torsional surface loading using the residual variable method. The main advantage of the present approach is that it eliminates the computational problems arising in the existing methods which are primarily based on Fourier or Laplace transformation techniques. Extensive numerical results for the circumferential displacements and shear stresses at various loc...
Ultra-fast charge exchange spectroscopy for turbulent ion temperature fluctuation measurements on the DIII-D tokamak (invited)
Uzun Kaymak, İlker Ümit; McKee, G. R. (2012-10-01)
A novel two-channel, high throughput, high efficiency spectrometer system has been developed to measure impurity ion temperature and toroidal velocity fluctuations associated with long-wavelength turbulence and other plasma instabilities. The spectrometer observes the emission of the n = 8-7 hydrogenic transition of C+5 ions (lambda(air) = 529.06 nm) resulting from charge exchange reactions between deuterium heating beams and intrinsic carbon. Novel features include a large, prism-coupled high-dispersion, v...
External Search Coil as a Means of Measuring Rotor Speed of an Induction Motor
Özlü Ertan, Hatice Gülçin; Keysan, Ozan (2009-07-03)
The study in this paper investigates whether the air gap harmonics can be identified by using an external search coil placed on the frame of an induction motor. For this purpose the study focuses on the prediction of rotor speed of an induction motor from external search coil emf, using spectral analysis techniques. In the first stage of the study the type of search coil which maximizes the induced emf is sought, also the position of the coil on the induced emf is investigated. Several motors are tested wit...
Nonlinear analysis of shells of revolution
Odeh, Ghassan M. H.; Akkaş, Nuri; Polat, Uğur; Department of Civil Engineering (1998)
Tester, Brian J.; Özyörük, Yusuf; Sutliff, Daniel L.; Bozak, Rick F. (2015-07-16)
Far-field inlet fan noise can usually be measured under anechoic conditions in some model scale fan rig test facilities but far-field aft fan noise measurements are often not possible because the bypass flow is ducted away through a throttle into an exhaust stack. A beamformer-based technique has been developed for processing measurements taken with an in-duct axial ('phased') array in the bypass duct, which with certain modelling assumptions, enables the fan broadband noise level and directivity to be pred...
Citation Formats
M. S. Özyar, “Localizing the focus of a converging ultrasonic beam using finite amplitude effects.,” Middle East Technical University, 1988.